Finding the Fourth Proportional to 42,665.20, 64,022.10 and 16,388.80

Step by Step Solution

1. Step 1: Write the proportion equation
   42,665.20 : 64,022.10 = 16,388.80 : x
2. Step 2: Convert to fraction form
   42,665.20/64,022.10 = 16,388.80/x
3. Step 3: Cross multiply
   42,665.20x = 64,022.10 × 16,388.80
4. Step 4: Simplify right side
   42,665.20x = 1,049,245,392.48
5. Step 5: Solve for x
   x = 1,049,245,392.48/42,665.20
6. Step 6: Final answer
   x = 24,592.53